Feasible muscle activation ranges based on inverse dynamics analyses of human walking

JOURNAL OF BIOMECHANICS

卷:48

Article

Simpson, Cole S.¹  Sohn, M. Hongchul¹  Allen, Jessica L.^2,3  Ting, Lena H.^1,2,3 

[1] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Wallace H Coulter Dept Biomed Engn, Atlanta, GA 30332 USA

[3] Emory Univ, Atlanta, GA 30322 USA

关键词: Motor control;    Musculoskeletal model;    Muscle coordination;    Biomechanics;    Gait;   

DOI  :  10.1016/j.jbiomech.2015.07.037

来源: Elsevier

【 摘 要 】

Although it is possible to produce the same movement using an infinite number of different muscle activation patterns owing to musculoskeletal redundancy, the degree to which observed variations in muscle activity can deviate from optimal solutions computed from biomechanical models is not known. Here, we examined the range of biomechanically permitted activation levels in individual muscles during human walking using a detailed musculoskeletal model and experimentally-measured kinetics and kinematics. Feasible muscle activation ranges define the minimum and maximum possible level of each muscle's activation that satisfy inverse dynamics joint torques assuming that all other muscles can vary their activation as needed. During walking, 73% of the muscles had feasible muscle activation ranges that were greater than 95% of the total muscle activation range over more than 95% of the gait cycle, indicating that, individually, most muscles could be fully active or fully inactive while still satisfying inverse dynamics joint torques. Moreover, the shapes of the feasible muscle activation ranges did not resemble previously-reported muscle activation patterns nor optimal solutions, i.e. static optimization and computed muscle control, that are based on the same biomechanical constraints. Our results demonstrate that joint torque requirements from standard inverse dynamics calculations are insufficient to define the activation of individual muscles during walking in healthy individuals. Identifying feasible muscle activation ranges may be an effective way to evaluate the impact of additional biomechanical and/or neural constraints on possible versus actual muscle activity in both normal and impaired movements. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free